Pneumatic governor



(No Model.)

B. WfPAIN & W. B. TREMAINE.

PNEUMATIC GOVERNOR.

Patented .June 15, 1897.

mummrmlmnnlnmldi INVENTORS ATTORNEY lhvrrnn STATES ATENT Prion,

ROBERT NV. PAIN AND XVILLIAM B. TREMAINE, OF NEW YORK, N. Y.

PNEUMATIC GOVERNOR.

SPECIFICATION forming part of Letters Patent No. 584,599, dated June 15,1897.

Application filed October 16, 1896. Serial No. 609,066. (No model.)

To aZZ whom it may concern.-

Be it known that we, ROBERT WV. PAIN and WILLIAM B. TREMAINE, citizensof the United States, residing at New York, in the county of New Yorkand State of New York, have in vented certain new, useful, and valuableImprovements in Pneumatic Governors,of which the following is a full,clear, and exact description.

This invention relates to pneumatic governors, particularly for springand like motors, and has for its object to provide such a simple,practical, and effective device as to commend it for general use as agovernor for all purposes to which it is adapted.

It is conceded that the form of spring-motor shown in the attacheddrawings is not new, and, further, that innumerable devices have beenpatented for governing such motors, but such devices are all more orless complicated, expensive, and inaccurate, particularly that classemploying fans, and none of such devices are adapted to be adjusted toregulate the speed of the mot-or as simply as by the means provided inthis invention, as will appear from a study of the annexed drawings, inwhich- Figure 1 is a side-view of a spring-motor with the improvedpneumatic governing device applied thereto, and Fig. 2 is a side view ofthe same.

Like numerals of reference placed on or near the several parts in thetwo drawings indicate the same constructions differently shown.

As before intimated, the spring motor herein shown is of a well-knownform, consisting of the coiled-tape spring 1, having its inner endrigidly secured to the main shaft 2, bearing in the upright 3 4 of theframe, the outer end 5 of said spring being secured by the stud 6 orother suitable means to the pulley 7 and gear 8, it being desirable insome cases to surround the spring 1 by a protecting-drum. (Not hereshown.) The pawl 9 and ratchet 1O serve here, as of old, to prevent anyback revolution of the shaft 2 and unwinding of the spring 1 from itsinterior and causing its outer end 5 to revolve the pulley 7, gear 8,pinion 11, and the auxiliary or governor shaft 12 at the highest rate ofspeed permitted by the resistance offered by the governing deviceconnected to said auxiliary shaft 12, and to a description of the novelform of governor herein shown we will now proceed. The said auxiliaryshaft 12 in this case has two crankbends 13 14 formed therein whichserve when in operation to give motion to their pitmen 15 16, connectingwith their respective pneumatics or bellows 17 18, and cause the latterto be alternately opened and closed. Said bellows communicate with theexterior atmosphere only through their respective and independent tubes19 20, which tubes are adapted to be partially or entirely throttled bythe slidevalve 21, having the handle 22 at its outer end and in whichare made two apertures 23 24:,so located as to correspond with the twoopenings 25 26 through the valveboard 27, the bottom of said openingscommunicating with their respective connectingtuhes 19 20.

The operation of our device is substantially as follows: Supposing theslide-valve 22 to be entirely closed, as shown in the drawings, and theinterior of the spring 1 to have been wound up by the forward revolutionof the shaft 2 given it by hand or foot power or other manner,then'owing to the inability of the bellows to either expel or suck inair through their closed tubes 19 20 they are prevented from moving andtherefore hold the shaft 12 and the spring 1, through the intermediategears, stationaryi. 6., assuming that the bellows,tubes, valves, &c.,are theoretically perfectbut in practice it is found that there is aslight leakage of air through the pores of the leather forming a part ofthe bellows or at the connections which is sufficient, under theconditions above assumed, to permit of a very slow revolution of saidshaft 12, which allows only of a greatly slower movement of thedriving-pulley 7. Assuming now that the slide-valve 22 is slightly drawnout, so as to permit a little air to be alternately expelled and suckedthrough the openings so made, then there is an immediate acceleration inthe movement of the governing-bellows and a corresponding increase inthe speed of the driving-pulley 7, and the farther the slidevalve iswithdrawn the greater the speed of the driving-pulley, and vice versa.

It is obvious that this governing device may be applied to electric andother forms of motors and that minor changes or modifications in theconstruction of the governor itself may be made without avoiding thespirit of this invention, as

WVhat we claim is- 1. In a pneumatic governor for motors, thecombination with a driven shaft, of a pair of bellows arranged uponeither side of said shaft, and each having a movable board, in dependentconnections between the said driven shaft and movable board of eachbellows, said connections being arranged to operate the bellowsalternately, and means for controlling the escape and admission of airthrough the said bellows, substantially as described.

2. In a pneumatic governor for motors, the combination with a drivenshaft having a double crank-arm, of a pair of pneumatic bellows, anindependent connection between each crank-arm and the movable board ofeach bellows, an air-port leading from each bellows and openingexternally, and a valve for controlling the escape and admission of airthrough the said air-ports and bellows, substantially as described.

3. In a pneumatic governor for motors, the combination with a drivenshaft having two crank-arms arranged at substantially right angles toeach other, of a pair of oppositelydisposed pneumatic bellows eachhaving an airport opening externally, the said bellows being arrangedupon either side of the driven shaft opposite the crank-arms, anindepend ent connection between each crank-arm and the movable member ofeach bellows, an airport leading from each bellows and openingexternally, and a valve for simultaneously opening or closing both ofsaid air-ports, substantially as described.

In testimony whereof We aflix our signatures in presence of twowitnesses.

ROBERT IV. PAIN. W ILLIAM B. TREMAINE. IVitnesses:

OWEN WARD, IV. A. BENJAMIN.

